Presently, to explain the physical picture of the TG driven DW dynamics, two theories of different origins are available, namely, microscopic (magnonic theory) theory [1]}, [2]}, [3]}, [4]} and macroscopic (thermodynamic theory) theory [5]}, [6]}, [7]}. The microscopic theory predicts that more magnons are generated in the hotter part and diffuse from the hotter to the colder part, and thus a magnonic spin current is produced. While magnons pass through the DW, magnons exert a magnonic torque on the DW by transfering spin angular momentum to the DW. Thus, magnons drive the DW toward the hotter region of the nanowire, opposite to the direction of the magnonic current [8]}, [2]}, [10]}. The thermodynamic theory suggests that, in order to minimize the system free energy, TG produces an entropic force which drives the DW towards the hotter region [5]}, [6]}.
